Anyone know of a place to pick up a small 3/2 pilot operated valve? Looking for the pilot pressures to act on both sides. Instead of explaining it, I made a picture. I just want something like this, adjustable spring pressure, and nice and small. You instrumentation guys (Shane) might have a lead on these. Oh, and cheap would be nice.

 

I don't know if they have what you want but you can sometimes find good deals at https://www.surpluscenter.com

 

I'll second that site.

 

Tater,

We typically use MAC brand valves that are similar to this. Heres their website:

http://www.macvalves.com/

I can get you the number of a local rep on Monday.




IIRC, Skeans Engineering is the local rep and they have an office right in Cowtown:

http://skeans.com/valves.htm

 

They have three valves on there, but none appear to be spring return. One has a detent on it, which is more of the opposite of what I'm after. But thanks, thats a step closer.

Shane, those links you posted only show solenoid actuated valves, I'm looking for air pilot only.

 

They probably only list the most commonly used one on their website. You could call Skeans and see what the options are.

I will try to look at my catalogues but wont have much time to do it since Im out of town all week.

 

Out of (morbid) curiosity, have you tried Princess Auto? Some of their hydraulic/pneumatic sections have people who actually know what they are talking about... And... I've learned not to bet against them.

Might be worth checking out Bosch Hydraulics (I know they have a shop in Edmonton). They were the cheapest, and best, for the fittings for the fuel filter... Not sure if they do air, but I'd expect so...

 

Yeah, talk to the guys and gals at Princess Auto they really know their stuff

You wouldnt want to talk to some of the tradesman, Engineering Technicians/Technologists, and Engineers we have right here on DTR.


Tate, to really spec things like this out you need lots of detail...application it is to be used in, port sizes you want to use, operating temperature, etc. etc.

 

Amot makes one, similar to a 4057, that air-piloted on both ends. I don't remember any adjustment though. I will dig through the books when I get a chance.

 

Its gonna be underhood, I want to try and rig up a BOV to keep turbos from barking. Problem with the standard BOV is its held closed by boost pressure, and opened by vacuum. If I can get this little valve, I have those to issues solved. Just need 1/8" NPT pilot ports, and either 1/8" or 1/4" NPT pressure ports. A 4/2 valve would also work, even a 5/2 if I had to, but that would just make it more plumbing.

I might take a look at PA, as sometimes they do have the odd thing there that you could use. But I'm not in a huge rush, so this is a back burner item.

 

FYI - the last time I spoke to somebody at the north store Hydraulic centre, it was a part time job for a full time millwright specializing in hydraulics... that is why I said SOME... He worked there cause he liked helping people having difficulties with their hyd/pneum. Don't knock everybody at a place... Almost everywhere has some people who know their stuff...

 

I'm sure Clippard will have something: http://clippard.com/

 

Tate, you need a pneumatic control valve and with two pilot sensors. You can find them, but the electronic stuff is cheaper. I wonder how fast the reaction speed of the pneumatic would be and how sensitive that they would be.

You could also just dump the exhaust energy to the turbo thru a wastegate, and prevent surge.

 

Dumping the exhaust energy is what stalls the compressor, which is what teh BOV is to avoid. It removes the load on the compressor side when the energy leaves the exhaust side.

No electronics, its not my style.

 

Not quite, you need some exhaust flow to accelerate the rotor so you can stall. Surge is basically, you unload the impeller and than load it back-up again. Unloading the impeller remove the positive pressure from the impeller face and drives the impeller into the housing. the back side of the impeller is still pressurized.